// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/expression/function_call_to_special_form.h>
#include <pollux/expression/special_form.h>

namespace kumo::pollux::exec {
    constexpr const char *kTry = "try";

    class TryExpr : public SpecialForm {
    public:
        /// Try expression adds nulls, hence, doesn't support flat-no-nulls fast path.
        TryExpr(TypePtr type, ExprPtr &&input)
            : SpecialForm(
                std::move(type),
                {std::move(input)},
                kTry,
                false /* supportsFlatNoNullsFastPath */,
                false /* trackCpuUsage */) {
        }

        void evalSpecialForm(
            const SelectivityVector &rows,
            EvalCtx &context,
            VectorPtr &result) override;

        void evalSpecialFormSimplified(
            const SelectivityVector &rows,
            EvalCtx &context,
            VectorPtr &result) override;

        void nullOutErrors(
            const SelectivityVector &rows,
            EvalCtx &context,
            VectorPtr &result) const;

    private:
        // This is safe to call only after all metadata is computed for input
        // expressions.
        void computePropagatesNulls() override {
            propagatesNulls_ = inputs_[0]->propagatesNulls();
        }
    };

    class TryCallToSpecialForm : public FunctionCallToSpecialForm {
    public:
        TypePtr resolveType(const std::vector<TypePtr> &argTypes) override;

        ExprPtr constructSpecialForm(
            const TypePtr &type,
            std::vector<ExprPtr> &&compiledChildren,
            bool trackCpuUsage,
            const core::QueryConfig &config) override;
    };
} // namespace kumo::pollux::exec
